/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/**
 * @filename: table_ident.h
 */

#ifndef ___TABLE_IDENT_H__
#define ___TABLE_IDENT_H__

/* Structure for db & table in sql_yacc */
class Table_ident :public Sql_alloc
{
public:
  LEX_STRING db;

  LEX_STRING table;

  Select_Lex_Unit *sel;

  inline Table_ident(Session *session,
                     LEX_STRING db_arg,
                     LEX_STRING table_arg,
                     bool force)
                    :table(table_arg),
                     sel((Select_Lex_Unit *)0)
  {
    if (!force && (session->client_capabilities & CLIENT_NO_SCHEMA))
      db.str=0;
    else
      db= db_arg;
  }
  inline Table_ident(LEX_STRING table_arg)
    :table(table_arg), sel((Select_Lex_Unit *)0)
  {
    db.str=0;
  }
  /*
    This constructor is used only for the case when we create a derived
    table. A derived table has no name and doesn't belong to any database.
    Later, if there was an alias specified for the table, it will be set
    by add_table_to_list.
  */
  inline Table_ident(Select_Lex_Unit *s) : sel(s)
  {
    /* We must have a table name here as this is used with add_table_to_list */
    db.str= empty_c_string;                    /* a subject to casedn_str */
    db.length= 0;
    table.str= internal_table_name;
    table.length=1;
  }
  bool is_derived_table() const { return test(sel); }
  inline void change_db(char *db_name)
  {
    db.str= db_name;
    db.length= (uint32_t) strlen(db_name);
  }
};

#endif /* ___TABLE_IDENT_H__ */
